Aptitude - Surds and Indices - Discussion
Discussion Forum : Surds and Indices - General Questions (Q.No. 5)
5.
If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:
Answer: Option
Explanation:
3x - y = 27 = 33 
x - y = 3 ....(i)
3x + y = 243 = 35 x + y = 5 ....(ii)
On solving (i) and (ii), we get x = 4.
Discussion:
21 comments Page 2 of 3.
Vikram Singh said:
7 years ago
5x-5y = 3x+3y
5x-3x = 3y+5y
2x = 8y
X ÷ y = 8 ÷ 2 so,
X = 4,y = 1.
5x-3x = 3y+5y
2x = 8y
X ÷ y = 8 ÷ 2 so,
X = 4,y = 1.
(4)
Ednan Malik. said:
7 years ago
(x-y) + (x+y) = 3+5,
x+x - y-y = 8,
2x-0 = 8,
2x = 8,
x = 8/2,
x = 4.
x+x - y-y = 8,
2x-0 = 8,
2x = 8,
x = 8/2,
x = 4.
(1)
Shahjahan said:
9 years ago
(x - y) + (x + y) = 3 + 5,
(x + x) - (y + y) = 8,
2x = 8,
x = 4.
(x + x) - (y + y) = 8,
2x = 8,
x = 4.
Carol said:
9 years ago
How to solve the y? Don't get it, Please explain it clearly.
Caroline said:
1 decade ago
x - y = 3
x + y =5
---------------
2x =8
Therefore, x = 4.
x + y =5
---------------
2x =8
Therefore, x = 4.
Otuboye said:
9 years ago
Please, can you explain clearly how to solve the y?
Anu said:
1 decade ago
How is (i) and (ii) solved and we get answer as 4??
Harsh said:
8 years ago
How to solve this? Please help me.
Anu said:
1 decade ago
2x=8; so x=4 ie.,(x+x)(-y+y) (3+5)
Shrikanth said:
6 years ago
Thanks all for explaining it.
(2)
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